You are building an app by using the Speech SDK.

 SpeechRecognitionLanguage must be set to " fr " (French).

 AddTargetLanguage( " de " ) must be used to specify German as the translation output.

Correct Code Completion

var speechTranslationConfig =

SpeechTranslationConfig.FromSubscription(speechKey, speechRegion);

speechTranslationConfig.SpeechRecognitionLanguage = " fr " ;

speechTranslationConfig.AddTargetLanguage( " de " );

Explanation

SpeechRecognitionLanguage → sets the source spoken language that the Speech service listens to (here, French).

AddTargetLanguage( " de " ) → adds German as the target translation language.

SpeechSynthesisLanguage would be used if you want to speak out the translation, but since the requirement is only about defining input and output languages, we use AddTargetLanguage .

Microsoft Reference

Speech translation with Speech SDK

Final Answer:

First blank → SpeechRecognitionLanguage

Second blank → AddTargetLanguage